1、Mary has gone to the teacher's offic.____has Joan
1、Mary has gone to the teacher's offic.____has Joan A、and B、neither C、so D、but 2、Has the train____yet? A、got to B、reached C、arrived D、arrived at 3、Have you ever____to Beijing? A、been B、gone 第一题选C,第二题选C,第三题选A,谁能给我讲一下为什么?